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小学生由于对求平均速度题目中的数量关系认识不清,又受单向行驶求平均速度思维定势的影响,在求往返平均速度时,往往出现如下错误:例:一学生上山时每分钟行40米,到山顶后又顺原路返回出发点,每分钟行60米,求该生上下山的平均速度?一些孩子常不加思考的计算为:(40+60)÷2=50(米)。如何解决这个问题?笔者认为,可按如下几步来辅导孩子。
As a result of the unclear understanding of the relationship between the number of average speed subjects and the influence of the average speed of one-way driving, the primary students often make the following mistakes when seeking the average speed of commute: Example: 40 meters, to the top of the hill and then back to the starting point along the way, 60 meters per minute to find the average speed of the students down the mountain? Some children often without thinking calculation is: (40 +60) ÷ 2 = 50 (m) . How to solve this problem? I believe that, according to the following steps to help children.